Standardisierte Auszeichnungssprachen der Computergraphik für interaktive Systeme

Computer graphics is used in many fields of computer science, ranging from the presentation of user interfaces to the visualization of scientific aspects. These application areas are extended by techniques for animation and for interacting with the content, based on the description by markup languages. This thesis proposes new methods and strategies for standardized markup languages for user interfaces and for learning materials. One focus is on the access to the graphical content for visually disabled people, achieved by an interactive exploration of tactile representations. In this thesis new methods for the description of scalable components for graphical user interfaces by using markup languages are presented. The components can be adapted to the limitations of a variety of output devices. Zoomable user interfaces provide a variable size for the components and the content. Novel methods are introduced for transmitting algorithmically generated user interfaces described by markup languages to various other computers. Graphics based on markup languages has substantial advantages in their creation, handling and application compared to conventional raster graphics. This thesis presents new methods and strategies in order to adapt the visual attributes of the graphics to the formatting of learning modules in different learning platforms. Among others, concepts for generating learning modules, which allow a flexible re-use in different learning scenarios, are developed. Plain text is the main source of information for visually disabled people working with computers. However, in many applications the holistic access to documents consisting of text and graphics is indispensable. To access graphical contents by means of tactile representations, methods are proposed for graphics based on markup languages. Additionally, methods for visually disabled people are developed to use mathematical expressions, as well as 2Dand 3D-graphics. All concepts are integrated into a tactile web browser where all variants of graphics can be accessed in a unique way.